/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.udf.utils;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.udf.api.type.Type;

import java.util.List;
import java.util.stream.Collectors;

/**
 * Transform between {@link org.apache.iotdb.tsfile.file.metadata.enums.TSDataType} and {@link
 * org.apache.iotdb.udf.api.type.Type}
 */
public class UDFDataTypeTransformer {

    private UDFDataTypeTransformer() {
    }

    public static TSDataType transformToTsDataType(Type type) {
        return type == null ? null : TSDataType.getTsDataType(type.getType());
    }

    public static List<TSDataType> transformToTsDataTypeList(List<Type> typeList) {
        return typeList == null
                ? null
                : typeList.stream()
                .map(UDFDataTypeTransformer::transformToTsDataType)
                .collect(Collectors.toList());
    }

    public static Type transformToUDFDataType(TSDataType tsDataType) {
        return tsDataType == null ? null : getUDFDataType(tsDataType.getType());
    }

    public static List<Type> transformToUDFDataTypeList(List<TSDataType> tsDataTypeList) {
        return tsDataTypeList == null
                ? null
                : tsDataTypeList.stream()
                .map(UDFDataTypeTransformer::transformToUDFDataType)
                .collect(Collectors.toList());
    }

    private static Type getUDFDataType(byte type) {
        switch (type) {
            case 0:
                return Type.BOOLEAN;
            case 1:
                return Type.INT32;
            case 2:
                return Type.INT64;
            case 3:
                return Type.FLOAT;
            case 4:
                return Type.DOUBLE;
            case 5:
                return Type.TEXT;
            default:
                throw new IllegalArgumentException("Invalid input: " + type);
        }
    }
}
